Telephony.



E. R. GORWIN.

TELEPHONY. APPLIOTION FLLE) NOVA, 1909A RHNBWED JULY 27,1911y PatentedMar. 11, 1913.

y f @j/W '10 this specification; l i l y f My invention 'has ,for 'itsyobject. the pro-4 NITED STATES PATENT OFFICE... N,

.E Livinn n. eoizwlnor CHICAGO, iniaNois. l

dirimirHONY.'

l.Specification of Letterslatent.

- Patented Mar. 11.1913.

criginai application' filed' Jneis., isoafsferiai Ne. 502.243. inviamiand thigappiia'tin nien November "4.1909, seriai N o. 526,196.4R`neiveaiuiyazuisii. sei-iai No, '640,933'.

To all, whom .2'15 may4 concern:

' citizen of thel United States,r`esiding at' o-fllllinois', haveinvented a 'certain new and' `useful'Improvement in Telephony,-`o vwhich the lfollowing -is,a full', clear, .conci e,4 and.'

elk'act description, reference beingfliad tothe.

accompanying drawings; 'forming a' part of .vision .of an iinproned,constructionfor a tele hone receiver" Where'byf it may be ren'- der'edvery compact andinay be -vei`iy readily assembled and disassembledfthis'appli' -cat-ion being a divisio'iiof my application .Seriali No.502,243,1iled rJ une 1.5, 1909.'

'It will., explainkmyinvention very .f'i'ill'y p by .reference to; the.accompanying drawing, inwhich:-'

Figure 14 is a .diagrammatic View i`i1'u's` trating a telephone eXchahge'system as .e'qu'i ped with a 'receiverl constructed. iiiziccordancejitith the preferred embodiment of tlie invention,. Fig. 2 isa longitudinal sec.'

tional View. of a. receiver 4(a part otits 4cas-j ing being absent)-n'iade in accordance with f the preferred embodiment-'of the-intention.Fig. 3 is aplany-iei't7 of`a plate' adapted to be secured yivith respectto the receiver casing.l `Fig. 4 lis a-'viewshowing `the electro-magnetVstructure, one lof the plates shown Fi'g. 3 being absent. "Fig 1sanelevation showing the assembly of the stru/cfrtures illustrated in`Ifigggsfand-4. .Fig- 6, is a pla-ii Viewl of the structureshown :11i

Fig. 5.

' Like-parts are indicated by 'similar char-1A Aacters otre-ferencethroughout thediii'erent.

40 figures. y c A Referring first to the diagialin the .sides 1 and Zot'- each t. lephone lineillustrated? extend to the-exch.- ge, Wheretliey are con-A` nected with the -tip and sleeve .contacts '3, Lof ajack sWitclrfAt ,each of the ,suhfy station' I have illustrated atransmitter 5',

-which is preferably included'seria-lly inthe line between the sidesthereof, battery c-uiy L rent being supplied'to the transmitter when 50the cord circuit illustratedat 'the exchange is connected with -the lineextending to the station where .the transmitteris located.` S haveillustrated atfthe exch-ange'l a plug (i, and a common battery, 7, whichcommon battery is shown-connected in a vco'nifeiitionalViiiannerbetweeii the sides of the cord 'pihoii'ic apparatus-,-asftliesefai'c' s o 4Well kno-Wn'- as' not" to require 'illustration' Ir have shoiif'n'illy. improred-.receiver Sateacli telephone.sub-station, and lwill ifstwlescribc vthe circuit relation 'thereofinvcorinectioii `niagnetiz'able iron core Awhich isx'foinicd tolpresentits polarfe'nds toithe rece'ii'jer diaf' phrag'in, thc polarendiof the core-carry# ing thejvoice current" i'yindings 9 aiid,10, lwhichare' parallel "relation with cach ',other-nnd togcltlier'arein serialrela ti on wil-li the line -and the` transinittei, these voicefunction-of energizing the-core of tli'e re'- ceiver due to, thepassage-.ofxlirect current -froni the. battery y7v through saidVwindings andfalso Vb'eing responsivei to. voice currents passed overthe' lines;- the i\ ,iudiii'gs '9"ai iil 10 being' wound to presentlittlel impedance 'to the' voicecurrents but being' ot' siltlicintlylow-resistance to permit of' the proper trans mission offcurrentfrom theco'ii-inioii bat-4 tery, theoli-m'ic resistance oeachTof-'tlie'-windings' being preferably fifty ohms. The

lWill so-ni'agrietize'th-ecore of lthe receiver' positive'sfign and theothei'pole of said core to have a .negative sign. 'Tlie "jointresistance afforded bythese vwindings is 'thus 'equal ,to' one-half ofthe resistance that is currentajvindiiigs, .p'ertoiiniiig .the double -V'90 `i`vindingsf9 andl 10 are .so-related to each if other and tol thecommon battery, Athat they' presented-by each `Winding alone. V- By thisa-irarigenient1, therefore, .-I am :enabled to which at tliejsani timeis wcll adapted to? the energizing vsource l'through the receiver.

through the transmitter 'ot supplying tliesaiiie 'with operatingcurrent.' I-have illustrated :it-each telephone statioma switchhook'11f` having an uppersecure a receiver-wliicli-is wellada-ptcd' tojespond to incoming telephonie currents and permit! ofthe transmission'of current vtroniv "for thevv 'pui-pose.. of energizing it, and

,' for 'the purpose' Contact. fo in'cl'uding'the-receiver-a niitter 1nserialrelation with the 'l1 en hen the switchliookisrelievedoftlieiveight-of the receiver and for including the signal 5bellA 12 and condenser 13 in bridge of 'the f invention, and Whiclr isnetto-beliniited"A to\ the use'that has been illustrated. 'y The .coreof t-he telephone 'receiveris'inade up of tivo coreportions14`tliat'are' of stripV iron, the" polar ends 'of thesecore'portions coils '9 and 410, while the other ends of said, coreportions'ltare closely'appr'oac'hed and firmly united to constitute theneutral/por` Thus theC core "portion ofthe receiver comprises tWo stripiron;

tion of i* the `core,

' pieces mechanically united at their rear adjacent lends to bringsaidcore portions into" the saine magnetic circuit 'and-'spread apart atthei r pol a r ends inorder'to permit ofthe.

disposition ofthe ivindings A9 10' about said o'rtions are preferablyformed but inasmuch as this feature on is of a. structural nature,

lsoft iron/for lthe core portions. The polar portions of ,the receivercore, are notched lfat141justback ofthe 'polar faces of thee-ore,

andin front of thefvoice coils 9.1` )v.`4 Af'shallow pan 15 hasits base?provided i 'tivo apertures 16l that are l-shaped at of the receiver topass therethrough stof thecore that are reduced'by lthe notches 141, theheight of the; notches at141 beinglsuclras' to correspond withtlie`tliickness ,of the pan 15,.,so. that 'the .bottoni of 145whentlie.panbott-oinis brought into regis ter ivithsaid notches. Inassembling the par,t st he portipnsof the core are engaged Withthepa'n'bottoin in thenianner Which $01 has been described, Where'after theportions forming the core. are claniped togetlier,l ivlieresuchas thatillustrated 11520:v By the ar- #rangenient which I have described, thevoicei f coils arelupon one side `of the pan and the polarprojections ofthe vreceiver coreare upon the' other side of the pan. When the panbottom-ia'nd the core are tobezinter-v l-njlocked, a., relative lateralmovem'entisv beingA Surrounded by the voiceE .current '.vvhen the stripsof insulation and the Iterouter sides 1f( to permit the pola-r porl areshaped at t-lieir inner sides 18 only" iai-.receive the portions ofv thepolaiextreni'i-v zt' e said pan may be-.slipped into said notchesbrouglit about between. the Aco'fic-aiid the vpan bottoni, a reverselateral movement. permit-V ting of-thedisengagenientofthe pan bottom andcore.

The conductors which lead to the voice current Winding are provided eachwith a terminal 21fornied preferably out of thick` strip brass,theseterminals,- in turn, beingy connected `with -t l ie joint terminalsof the receiver coils. These terminals are disposed between two stripsof insulation Q2 which 'have interlocking connection with the terminals,to preventnioveinent ofthe terminals with respe'ctto theI strips ofinsulation minalsareassembled. The core ,of the receiver is` .fdisposedbetween the strips of in,

,sulationf and a single fastening 'screiv 23 i is passed through thecore and ytlie'strips of insulation and-serves "to bind the coie,'tliejstrips of insulation and the terminals yin fixed relation;

` hile I have herein shoivnand particle 5 larly describedl the4preferred `eiribodiinent of inyiiiventioinl do not ivisli to be limitedto theprecise construction and arrangen'ieiit set forth, as changesinayreadily be made witho-ut depaiting from the spirit of theinvention., f i .f

Having thus "described my invention, I claim as neiv and desire tosecure lby Let@ tei-s Patent the following 1. te'lephoiie receiver'including a, pan, a

'diaphragm supported by the pan in opera! tive relation with the'receiver core, the '100 voice winding of thereceiver lying lu pon thatside of the'pa'n which is opposite tothe side on Vwhich vthe/diaphragmis disposed, thel receiver core, projecting through the pan bottoniAinto operative relation ivith the re'- ceiver dia'plii'agni, tlie panbottom thus being interposed jbetiveen the extremity of the Coreadjacent tothe diaphragnr and the voice ivinding, said core being`notched back of a polar face thereof and in frontof the voice curre'ntWinding, `the bottom of said4 panI having y an opening formedtherethrough, Which, at one portion, is capable ofr receiving thenotched portion; of the core and is not capable of receiving the portionof the core above the notched portion, and having aiiotlierpart Whichpermits of' the core portion above the notcliing to pass througlithe panbottoni, ivhereby. the pan bottom and core poi't-ioii may be assembled12`0 and interlockedQ 2., A telephone receiver igncluding a pan, adiaphragm supportedbv he pan in operative relation with the receivercore, the receivercore projectin through lthe pan bottominto/operativereaftion with the receiver the core and is not capable of receiving theunnotched portion of the core, and having another part which permitsofthe unnotched core portion to pass through the pan bottom, whereby thepan bottom and core-portion may be assembled and interlocked. i

3. A telephone receiver including a pan, aA diaphragm supported by thepan in operative relation with the receiver core, the receiver coreprojecting through-the pan bot tom into operative relation with thereceiver diaphragm, said core and gthe bottom of said pan beingyconstructed to have interlocking engagement.

j 4. A telephone receiver .having terminals for connection with the lineand the Winding of the receiver, strips of insulation between Whichtheterminals-are disposedan'd having interlocking connection with theterminals and serving to positionl the same rela-y tively, and means forfixing said terminals, strips of insulation `and receiver qnre withrespect to each other.

5. A telephone receiver havin terminals VJfor connection 4Withthe linean the winding of the receiver,strips of insulation between which theterminals'are disposed and having interlocking connection with thetermnials and serving to positlon the same relatively, the core of thereceiver passing between the strips of insulation, and means for fixingsaid terminals, strips of insulation and receiver core with respect toeach other.

6. A telephone receiver having terminals for connection with the lineand the winding ofthe receiver, strips of insulation between which theterminals are disposed and having interlockingconnection with the'terminals and serving toposition the saine relatively,

, the core of the receiver 'passing between the strips of insulation,and a screw Whose stern passesthrough the strips ofinsulatlon and the',receii-'er core to bind the receiver core, strips of lnsulation' andterminals 1n posi-- tionwith respect to each other.. vIn .Witnesswhereof, I hereunto subscribe my name this second day of Nov`elnber,-A.D.

ELMER R. CORVVIN. XVitnesses CARRY B. DAv1s, CLARENCE E. Coon.

